.game {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.difficulty-selection,
.tips,
.cells {
  margin-top: 20px;
}

.difficulty-selection button {
  width: 100px;
  height: 50px;
}

.board {
  display: grid;
  grid-template-columns: repeat(10, 30px);
}

.cell {
  width: 30px;
  height: 30px;
  border: 1px solid #ccc;
  text-align: center;
  line-height: 30px;
  cursor: pointer;
  background-color: rgba(193, 193, 193, 0.7);

}

.cell-action {
  box-shadow: 0 0 5px rgba(0, 0, 0, 0.3);
  background-color: rgb(192, 192, 192);
}